Unfooooortunately – you can’t “replace” an existing registered trademark. You’ll have to go through the process again. What to do with your existing trademark? Try selling it if you think that’s possible, but most companies will keep it to preserve it in case they ever want to revert back.
In the market for a trademark? Visitfor a quick price quote from an experienced trademark attorney. All legal projects are backed by a money back guarantee. Good luck w/ the branding change!